Here's a little story. My cousin and his wife are really irresponsible and since their kid is like 1 month old they make him watch "children videos" on youtube every day (including spiderman and elsa ones) just so he would shut up and they wouldn't have to care for him. Now the kid is 3 years old and he can't even say a word except "ma" for mom and "ta" for dad, he is severely underdeveloped and as soon as someone brings it up the parents get extremely defensive and ignore what anyone says.

Last week he was diagnosed with severe ADHD and potentially autism (doctors not sure yet)